/**
 * ISC License
 * Copyright (C) 2024 Huawei Device Co., Ltd.
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

"use strict";

import xml from "@ohos/xmpp_xml";
import { canUpgrade,upgrade } from "./starttls";

/*
 * References
 * https://xmpp.org/rfcs/rfc6120.html#tls
 */

const NS = "urn:ietf:params:xml:ns:xmpp-tls";

async function negotiate(entity) {
  const element = await entity.sendReceive(xml("starttls", { xmlns: NS }));
  if (element.is("proceed", NS)) {
    return element;
  }

  throw new Error("STARTTLS_FAILURE");
}

export default function starttls({ streamFeatures }) {
  return streamFeatures.use("starttls", NS, async ({ entity }, next) => {
    const { socket, options } = entity;
    if (!canUpgrade(socket)) {
      return next();
    }

    await negotiate(entity);
    const tlsSocket = await upgrade(entity.service);
    entity._attachSocket(tlsSocket);

    await entity.restart();
  });
};
